Remove SYCL_PI_LEVEL_ZERO_USE_IMMEDIATE_COMMANDLISTS from Graph E2E tests

[EwanC]

Remove lit RUN lines explicitly setting SYCL_PI_LEVEL_ZERO_USE_IMMEDIATE_COMMANDLISTS now that we've transitioned over the the V2 L0 adapter in UR

Originally posted by @pbalcer in #19402 (comment)